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An equation is a mathematical statement that has two expressions separated by an equal sign. The expression on the left side of the equal sign has the same value as the expression on the right side. One or both of the expressions may contain variables. Solving an equation means manipulating the expressions and finding the value of the variables. An example might be:x = 4+8 to solve this equation we would add 4 and 8 and find that x = 12.
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A variable represent an unknown number in an equation, that's according to my own definition


2x - y =12

x and y are unknown numbers therefore they're variables

I hope it helps
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